Super Jet 62T and mod b jetting help

[sturat]

Looking for a good baseline on a stock full 62t motor with mod B pipe and stock carbs. Sea level in FL and it's been pretty hot, around 90F. In my RN with b1 prop

Any help is appreciated and will be met with several POB's

 

[Roseand]

http://www.x-h2o.com/index.php?threads/carburetor-specs-database-superjet-and-blaster-1.19403/
For dual 38s:
FPP recommends 135 main and 70 pilot with 61x cylinder, should be similar for 62t

 

[BruceSki]

If running open style flame arrestors try this.

70 pilot
135 main
95 gram spring
2.0 N&S

May need 72.5 pilot depending if you have chokes or primers.


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[sturat]

If running open style flame arrestors try this.

70 pilot
135 main
95 gram spring
2.0 N&S

May need 72.5 pilot depending if you have chokes or primers.


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My ski guy set it up, not me.. but I'm having some issues when in the water. Idles fine, can get tiny blips in but anything over 7%-10% is just bbbbbbbbbbbbbbbbbb. Stock f/a box with choke still on it

72.5 p
140 main
2.0 n/s
"90-ish" gram spring, it's at 20-21 psi popoff. I do not know the turns out but I did half out on the high end on both from what it was and it made it worse, I dialed them back in the half turn and have not messed with them since.

 

[BruceSki]

How many screens in flame arrestor?


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[sturat]

How many screens in flame arrestor?


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All 3 I believe I didnt take any out

 

[BruceSki]

Pop off is much too low for three screens. Try 1 screen in there and ride it again.

I think 140 main is too large as well.

Stock porting?


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[sturat]

Yes all stock motor and carbs... trying to get it running properly before I throw more money at it, if I do. What popoff do you recommend with 1 screen?

 

[BruceSki]

I’d run the pop off you have, go to 135 main, 70 or 72.5 pilot.

high speed screw around 1 turn out.
Low speed around 1/2 out.


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[sturat]

U da mane... thank you

 

[Kawy750]

Just went through a similar issue.
135 mains
70 pilot
1.5 NS
A/M arrestors with chokes
Limited pipe and ADA head
Also right around sea level in CT
With a starting pop off of 26 it did the same thing. Really struggled at low speeds and couldn’t get up and go. Ended up with a pop off at 45 now and it’s running great! Only issue I have now is it’s hard to restart after riding a bit. Idles all day and is very snappy but if I shut er down to chill it won’t start right back up. Always something to tweak and turn!

 

[theRabbitbutton]

I got...

135 mains
75 pilots
95g springs
1.5 NS
Low speed 1.0 turn
Hi speed 1.5 turn
Pop off at roughly 32psi

1200 foot elevation

Ada head 37cc domes
Factory limited factory bpipe with JM waterbox
Aftermarket flame arestors with prefilter
Choke removed.... primer installled


Runs crisp!

 

[KID'S JET]

Mine 15 superjet also in sfl
135 main
75 pilot
95g spring
Can’t remember my high and lows between 1 - 1.5
Mod b pipe
Ada head 35cc domes
Was running good bogging out top end now think I need to clean carbs